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run code in 150+ php & hhvm versions
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<?php $a1 = array(2,array()); $a2 = array(2); $b = array_diff_assoc($a1, $a2); var_dump($b);
based on 720Tr
Output for 4.3.0 - 7.1.0
array(1) { [1]=> array(0) { } }